Description

Previously in #16327 I replaced the booking list's accent color with listRowBackground modifier since the accent color affects the header's button color.

Turns out, listRownBackground also comes with a focus ring that cannot be get rid of even with focusEffectDisabled modifier from my testing.

This PR gets rid of the selected border by applying a workaround:

• Set the list row insets to zero and apply paddings around the row contents manually
• Set a background color to the row contents for selected state.

Test Steps

1. Build and run the app on an iPad simulator.
2. Log in to a CIAB store with existing bookings.
3. Navigate to the Bookings tab and select any booking in the list.
4. Confirm that there is no border around selected items.

Screenshots

Before	After

• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.